Bit gauge and positioning or leveling attachment



Nov. 18, 1930. M. BETANCOURT 1,

BIT GAUGE AND POSITIONING OR LEVELING ATTACHIENT Filed Dec. 3, 1928 INVENTOR ATTORNEY V given depth.

7 vhorizontal plane.

Patented Nov. 18 i it i 7 UNITED STATES ICE; I

i 311 'Gliniijhiili-PQSITIOKIEG on A' iemmz Application filed December 3, 1928." sefia1 no. .32s,55o.

I This invention relates to improvements iiifffinoludes a oflat disk or;plate-1lhavingatubit' guides and levels'therefor and has for its bular sleev e 12' exte ding from one .side I primary object, the provision an attachthereof. The bore 13 ofthe sleeve extends ment for a' boring bit by which a .user may through the plate and is of a uniform diama be guidedduring the boring of a hole to eneter throughout. ,Mountedin the disk 1 1 at. 5

able himto bore straight, and which attachright-angles to eachJot-her are two spiritlevels ment may be adjustably attached to the bit to 14% which are readable on the outer 'face of the 7 limit the penetration thereof to permitthe disk and which are of the usual well-known accurate boring of a hole or dowel socket of construction,each of which includes a-s eale d transparent glass tube l5 filled with liquid Another object of the invention resides in a to PIQVidO'iLIl air bubble 16 therein. These bit guide and level which maybe used when spirit .levelslare sighted by a user when borboring either in a vertical or horizontal inga hole on avertical plane'but whenthe atplane. I tachment is used forboring on a horizontal A further object of the invention is the plane,;the-spirit level 17 mounted exteriorly' 0,5, provision of a bit guide having interchangeupon the sleeve 12 is sightedf This level 17- r able means by which the. same may beapisconstructed similar to the levels l i so that I lied to bits of various diameters. aj'furtherdescription is not -believed 'neces- A still further object'is to provide a bit sary.; v i I y,

3. attachment of the above kind which'may be 1 ,TlllQflClGd intothe'wall of the sleeve 12 is compactly carried in the tool chest of a car a. clamping set screw18 which is screwed l penter 0r mechanic for instant use when detight against thebit, 19 as shown in Figure 4 sired. i i i otthe drawing-when theat-tachment is ap:

With these and other objects in view, the plied to a bitof adia ne'ter equal to tl e inner gil-invention resides in" certain novel construe diameter of the bore 18.

tion and combination and arrangement of in use,' the attachment isfclamped'to the;

parts, the essential features of which are bit in the manner-wet described but is adjusthereinafter fully described, are particular- I: ed thereon with respect to the ifree end of the v ly pointed out in the appended claims, and bit for a distance gequal to that oftli'e depth are illustrated in the accompanying draw Of llllQ holeto ,bebcred. [This adjustment 80.

'ing, in which V i I will enable adowel socket of a given depthto Figure l is a perspective view of my guide be accurately;drilled,' as the end of the sleeve a and level attachment for use upon abit. will: st ik the work. hen the desired depth Figure 2 is a vertical longitudinal secis reached and thus limit further cutting. In I 35 gtional View on theline 22 of Figure l. sta'rtin'gthe boring operation,theuserplaces 85.

Figure 3 is a. horizontal sectional view on the pointed endof the hit upon thelwork the line 3'3 of Figure 2. f axially centersthe same by sighting the spir t a Figure 4 is a side elevation showing the levels'l l or17 depending uponwhether he s use of my attachment in boring ahole ona to bore on alvert cal or horizontal plane.

v I VVhenthelb blOle 16is?centeredbetween'the Figure Sis atop plan view of the guide and ends of the tube or any indicating marks level. which 'maybeprgvided thereomheis assured f Figure 6 is a perspective view thereof. "that the bit is truly 'centered and proceedsto Figure 7 is a detail perspective view of one rotate the bit by; the turningj oi the'usual .riof the interchangeable bore reducer-guides. brace in which the bit is held. The operator Referring to-the drawings, in which-like 1 should;Watchjthe spirit-levels.during the reference characters refer .to like parts boring'operation'togui'de him andupon any throughout. the several views thereof, the .deviation; shown by the* spirit levels will numeral 10 designates my improved bit guide readily reveal that 'thebit is not boring in and level attachment in its entirety which the desired path yvhich nay be 'c oi rectedby' 10c the operator again centering the bit. It will therefore be seen that sockets and holes may be formed ina 131666 of. work which are true and ofa given depth.

In instances where a bit of a smaller diam,- eter is to be used in connection with my at tachment, I provide a set of interchangeable bore reducing elements, one of, which is l shown at 20 foruse in connection with a bit 21; The set maybe made to accommodate the standard size bits and the same individually used i-nicon nection' with the guide and level attachment. The bore reducing having a smaller bore therein, said reducing sleeve having an opening therein for the passage of said set screw, a plate on one end of said reducing sleeve for engagement with said disk, and coacting means between said plate and disk for preventing turning of the reducing sleeve with respect to said tubular sleeveand for aligning said'opening with saldset screw. i p

In testimony whereof I have affixed my signature. 1

' v BETANCOURT.

element 20 includes a tubular'sleeve 22whose" external diameter is substantially the same 7 the diameterlof thebore 13: so as to snugly fit therein whilethe internal diameter is the i sameias the diameter 'ofthe bit-21. One end of the-sleeve 22 has-a plate :23 integral therea i with which carries a pin 24 for receptionin a hole or socket 25 provided in'the'dlsk "11.

* The sleeve 220f the redncer'is inserted into 7 the'bore 1 3 'and is of; a length eqnaltothe length thereofwhile the plate-23 rests flat against the disk: 11' with the pin "24 in the socket or hole "25. The pin and'socket pre vent turning of the reducerlwith respectto-I the gmdeand level 10 and align an openmg.

26 in. the sleeve 22 with. the set screw 18 to allow the set screw to pass therethrouglr to clampthe attachment to" the bit. The reducing element 20 may be readily inter- V changed'by unscrewing the, set screw and V withdrawing the same from the bore 13.

yention, it-is obviousthat many of While I have described what I deem'to be themostdesirable embodiment of my in.-

the details may be varied without in anyway departing from the spirit of my invention, and I therefore do not limit myself to the exact;

details of construction herein set forth nor eto anything less than the whole of my inven-I tionlimited only bvthe appended'claim's.

*respect to said sleeve and opening 'Wlth' respect fto'said disk, a bore reducer element I tubular sleeve and having a VWhat is claimed as new is V 7 1. A b t gauge and positioning or leveling attachment comprising a' tubular sleeve, a set screwthreaded in said sleeve forclampi-ng turning of said bore reducerfm'ember with :for alignmg'said set screw.

Ihole therein for the passage of said set screw, 1 andcoacting means for,preventingraccidental 2.:1Abit gauge and positioningand leveling attachment compjr slng a tubular sleeve hav- {mg a bore of a uniform diameter throughout,

set screw threaded into saidtubular sleeve *byfwhich' thesame maybeclamped to a bit passin therethrough, a reducing sleeve of a V diameter to fit within sziidtubular sleeve'andj diskon one end of said tubular sleeve, 1a 7 

